Asbestos composition.



In cases Where a stro and waterproof material 1s required.

mass. insoluble in water, the com osition is both P TEN OFFICE.

HENRY C. TODD AND CHARLES MAYR, OF CHICAGO, ILLINOIS, SAID MAYR, ASSIGNOR TO SAID TODD.

ASBESTOS COM POSITION Specification of Letters Patent.

/ Patented Aug. 1, 1905.

Application filed November 12. 1904. Serial No. 232,521.

that the following is a full, clear, and exact description thereof.

This invention relates to a novel fireproof composition in which asbestos is the rincipal mgredlent and which is ada ted or use and dura le fireproof The invention also includes the method or process of making suchcomposition.

The composition made in accordance with I our invention consists of asbestos and silico-i 1n sheets or in the form of specially shaped or aluminate of soda, the silico-aluminate of soda being adherent to the filaments of as g bestos in the form of a coating or covering and constituting a binding material which 1 fills the intersticesv between the asbestos filaments and unites said filaments into a solid I The silico-aluminate of soda being fireproof and waterproof an is also exceedin y hard, toufgh, and strong.

11 the manu acture of the composition an form of commercial asbestos may be use and the asbestos is first formed into sheets or pleciam any o 1 e processes usuy used in the manufacture of asbestos for commercial uses, the asbestos fibers being combined with such admixture of bindin or ceggnting material as is necessary to hol or 'fimd the same together or to give solid or permanent form to the sheets or articles, as

eretofore common in this art. Silicate of alumina and silicate of soda in owdered or pulverulent form are then mixe with water, the mixture being stirred so as to give it uniform consistency, and the asbestos sheets or articles'are then immersed in the mixture.

natural product insouthwestern Missouri and Tennessee, the formula of which is approximately Al,,O (SiO +2aq but we have no doubt that silicate of alumina having like characteristics and of substantially the same formula may be found m other I places. It will of course be'understood that alumina as found in its natural condition for use in carrying out our novel process may be readily determined. So far as we have y chemical analysis the fitness of silicate of ar he" ll Q a I J been able to termine the silicate of soda I should contain at least thirty per cent. of

Na Op We have found that 'good' results' are I jobtained when the ingredients above referred to are used in proportion as follows:

Water one thousand gallons; silicate of alumma fifteen hundred pounds; silicate of v s'oaa eight hundred pounds.

6 as 88 OS i molded articles is then di ped or lmmersed'f f until well impregnated therewith. The asin the mixture and allowe to remain therein bestos being porous in :character, said mixture will penetrate the asbestos and fill the I spaces or interstices between the fibers there- F of, it being understood that inasmuch'a's" the solid constituents of the mixture are very. 1 finely pulverized and as the water acts as a; I vehicle therefor the admixture will permeate the sheet or mass of asbestos being htreatgid e 111 vidu al asbestos fibers in sai s ts to dry and is then subjected to a graduallyincreasm heat until it reaches a temperawater origmally con ame 1n driven ofl in dry-in the article, and the effectcate of alumina and silicate of soda is to produce a molecular combination Withoutfw sionthat is to say, through the influence of l a temperature not higher than 800 Fahrenheit continued for the necessary period of l the silicates of soda and alumina, ,0 o a ultimately the sdiumalua silicate in a solid. I I h I nnna silica -e will be aerent Her bemg we 1m re ated with the IIllX- ture the asbestos slieefi or article is allowed i of the heat upon t e dried admixture of sili- I V i time a chemical union takes place between' ture approxlma ely 800 Fahrenheit. The e IIJJX ure isfibers and amacoatin 1 -n -wel a g e-taeu te interstices thereof. It

-made cellular or porous, as is often don hflin making sheet-asbestos for various purposes.

.fivhere great strength is required. Moreover,

act to unite or cement together the indiy ual fibers or filaments of the asbestos, as Well as cover or coat such fibers or filamen so that the resulting product is hard and t ill in character and is solid except so far asFgt e sheet or article may have been intentionhlly In such baking operation the heat is gradually applied and will usually be contiriued for a considerable period of time, depending on the'nature and characteristics of the inaterials used. With some natural silicate; of alumina and when the baking is accbmplished at temperatures considerably loiwer than 800 Fahrenheit it is in some cases nec essary to continue the baking operationZ-for from two to four weeks. We have foimd that in the use of silicate of alumina obtained from natural sources and having substantially the chemical formula as above indicated in connection with silicate of soda v mg the characteristics hereinbefore ,de: scribed that during the baking operatlop a chemical reaction takes place according to the following formula: t

(A1 0 (SiO 2aq) (Na O) (SiO Al Na SnO Such chemical reaction in the baking process produces a specific compound, our understanding being that one H O is retained eyen if the temperature is above 600 Fahrenheit and that in the resulting compound file chemical union of silicate of alumina d silicate of soda is a true sodium-alumina glicate. a

The sheets or articles constituting he product of the process above described phesess novel and valuable properties. The product when in the form of sheets or other articles while capable of resisting firelf'of about 2,000 Fahrenheit is also waterproei Moreover, it is exceedin ly strong and to gh in character and capa le of use in the product in sheet form or in the fornifof special articles may be molded or shaped originally either in solid form or with air-T spaces or of cellular structure, so that file material will be both light and strong, while possessing only slight heat-conducting pacity. The product is, moreover, wa proof and capable of resisting the action inf the elements for any length of time, so that it may be used out of doors or when expo aed constantly to the action of the elements The silico-aluminate of soda produced y the process herein described differs other substances generally included u H the same term which are produced by in v of the components of the mixture becau can be carried out only by the use of a cate of alumina of the general character h inbeforeset forth-that is to say, a form of silicate of alumina capable of uniting by ,chemical reaction with the silicate of soda when subjected to a temperature of about 800 Fahrenheit or less. The silico-aluminate of soda produced in carrying out our process is therefore the chemical substance ormed by the molecular combination of silicate of alumina and silicate of soda produced .by chemical reaction under a temperature of about 800 Fahrenheit or less and without fusion.

We claim as our invention 1. A com ositlon consisting of asbestos fibers and si ico-aluminate of soda-produced at a temperature of about 800 Fahrenheit or less.

2. An asbestos sheet or article in which the .asbestos fibers are united or cemented together by silico-aluminate of soda produced pt a temperature of about 800 Fahrenheit or ess.

3. An asbestos sheet or article in which the asbestos fibers are coated with and cemented together by silico-aluminate of soda produced at a temperature of about 800 Fahrenheit or less.

4. As a new product, asbestos fibers coated with silico-aluminate of soda which fills the spaces or interstices between the asbestos fibers and forms therewith a solid mass or body, said silico-aluminate of soda being produced under a temperature of about 800 Fahrenheit or less.

5. The process of making an asbestos composition which consists in coating the asbestos fibers and filling the spaces between the same with an admixture containing silicate of alumina and silicate of soda and thereafter baking the composition at a temperature of about 800 Fahrenheit or less.

6. The process of making an asbestos comosition which consists in applying to the as- Eestos fibers an admixture consisting of pulverized silicate of alumina, silicate of soda and water, and thereafter drying and baking the same under a temperature of 800 Fahrenheit or less.

7. The process of making an asbestos com- ,position which consists in preparing an ad- :mrxture of pulverized silicate of alumina, silicate of soda and water, impregnating a mass of asbestos fibers with said admixture, drying the mass to remove the water and subjecting the mass to heat at a temperature of about 800 Fahrenheit or less.

8. The process which consists in forming a sheet or article of asbestos fibers, coating the fibers and filling the spaces between the same with an admixture consisting of pulverized silicate of alumina, silicate of soda and water, andfthereafter baking the sheet or article undata temperature of about 800 Fahrenheit ion-less.

H7. COATING; P

ROCESSES AND MISCELLANEOUS PRODUCTS? ""9. The process'wmcn conslsts 1n Iorming a as our invention we afiix our signatures, in sheet or article of asbestos fibers, pre aring a resence of two witnesses, this 10th day of mixture fof gulveaized silicate of aumm' 121a lovember, A. D. 1904.

s 'cate 0 so a an water, impre ating t e asbestos sheet or article with suchi iimixture, drying the sheet or article to remove the water, and subjecting the same to heat of about Witnesses: 800 Fahrenheit or less. C. CLARENCE POOLE,

In testimony that we claim the foregoing GEORGE R. WILKINs. 

